The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 2009
Filed:
Jun. 19, 2003
Fabrizio Cavani, Modena, IT;
Carlo Fumagalli, Albano San Alessandro, IT;
Roberto Leanza, Milan, IT;
Gianluca Mazzoni, Torre Boldone, IT;
Barbara Panzacchi, Bologna, IT;
Fabrizio Cavani, Modena, IT;
Carlo Fumagalli, Albano San Alessandro, IT;
Roberto Leanza, Milan, IT;
Gianluca Mazzoni, Torre Boldone, IT;
Barbara Panzacchi, Bologna, IT;
Lonza Spa, Scanzorosciate, IT;
Abstract
Catalytic compositions of oxides of titanium, vanadium and tin that are suitable for the production of phthalic anhydride by oxidizing o-xylene and/or naphthalene in the gas phase. The catalysts exhibit excellent activity and selectivity. The catalyst contains 2 to 15 percent by weight (calculated as VO) of vanadium, 1 to 15 percent weight (calculated as SnO) of tin and 70 to 97 percent by weight (calculated as TiO) of titanium. In a preferred embodiment the catalyst also contains up to 5 percent by weight (calculated as MO) of at least one alkali metal, preferably lithium, potassium or rubidium, and more preferably cesium. In an even more preferred embodiment, cesium is present in an amount of from 0.01 to 2 percent by weight (calculated as CsO).